Auto merge of #85673 - csmoe:export-exe-sym, r=bjorn3

RFC-2841: add codegen flag export symbols from executable

Closes #84161
r? `@nikomatsakis` `@Mark-Simulacrum`

2 files changed, 19 insertions, 5 deletions

diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs
index 878a670cba3..48d24ecf412 100644
--- a/compiler/rustc_codegen_ssa/src/back/link.rs
+++ b/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -2082,7 +2082,12 @@ fn add_order_independent_options(
         // sections to ensure we have all the data for PGO.
         let keep_metadata =
             crate_type == CrateType::Dylib || sess.opts.cg.profile_generate.enabled();
-        cmd.gc_sections(keep_metadata);
+        if crate_type != CrateType::Executable || !sess.opts.unstable_opts.export_executable_symbols
+        {
+            cmd.gc_sections(keep_metadata);
+        } else {
+            cmd.no_gc_sections();
+        }
     }
 
     cmd.set_output_kind(link_output_kind, out_filename);
diff --git a/compiler/rustc_codegen_ssa/src/back/linker.rs b/compiler/rustc_codegen_ssa/src/back/linker.rs
index d4a9db4af23..8e5ac9da4ac 100644
--- a/compiler/rustc_codegen_ssa/src/back/linker.rs
+++ b/compiler/rustc_codegen_ssa/src/back/linker.rs
@@ -640,9 +640,14 @@ impl<'a> Linker for GccLinker<'a> {
 
     fn export_symbols(&mut self, tmpdir: &Path, crate_type: CrateType, symbols: &[String]) {
         // Symbol visibility in object files typically takes care of this.
-        if crate_type == CrateType::Executable && self.sess.target.override_export_symbols.is_none()
-        {
-            return;
+        if crate_type == CrateType::Executable {
+            let should_export_executable_symbols =
+                self.sess.opts.unstable_opts.export_executable_symbols;
+            if self.sess.target.override_export_symbols.is_none()
+                && !should_export_executable_symbols
+            {
+                return;
+            }
         }
 
         // We manually create a list of exported symbols to ensure we don't expose any more.
@@ -969,7 +974,11 @@ impl<'a> Linker for MsvcLinker<'a> {
     fn export_symbols(&mut self, tmpdir: &Path, crate_type: CrateType, symbols: &[String]) {
         // Symbol visibility takes care of this typically
         if crate_type == CrateType::Executable {
-            return;
+            let should_export_executable_symbols =
+                self.sess.opts.unstable_opts.export_executable_symbols;
+            if !should_export_executable_symbols {
+                return;
+            }
         }
 
         let path = tmpdir.join("lib.def");